About CC Licenses

Creative Commons licenses give everyone, from individual creators to large institutions, a standardized way to grant the public permission to use their creative work under copyright law. From the reuser’s perspective, the presence of a Creative Commons license on a copyrighted work answers the question, “What can I do with this work?”

The Creative Commons License Options

There are six different license types. They are listed from most to least permissive below:

CC BY: This license allows reusers to distribute, remix, adapt, and build upon the material in any medium or format, so long as attribution is given to the creator. The license allows for commercial use.

CC BY includes the following elements:
BY – Credit must be given to the creator.

CC BY-SA: This license allows reusers to distribute, remix, adapt, and build upon the material in any medium or format, so long as attribution is given to the creator. The license allows for commercial use. If you remix, adapt, or build upon the material, you must license the modified material under identical terms.

CC BY-SA includes the following elements:
BY – Credit must be given to the creator.
SA – Adaptations must be shared under the same terms.

CC BY-NC: This license allows reusers to distribute, remix, adapt, and build upon the material in any medium or format for noncommercial purposes only, and only so long as attribution is given to the creator.

It includes the following elements:
BY – Credit must be given to the creator.
NC – Only noncommercial uses of the work are permitted.

CC BY-NC-SA: This license allows reusers to distribute, remix, adapt, and build upon the material in any medium or format for noncommercial purposes only, and only so long as attribution is given to the creator. If you remix, adapt, or build upon the material, you must license the modified material under identical terms.

CC BY-NC-SA includes the following elements:
BY – Credit must be given to the creator.
NC – Only noncommercial uses of the work are permitted.
SA – Adaptations must be shared under the same terms.

CC BY-ND: This license allows reusers to copy and distribute the material in any medium or format in unadapted form only, and only so long as attribution is given to the creator. The license allows for commercial use.

CC BY-ND includes the following elements:
BY – Credit must be given to the creator.
ND – No derivatives or adaptations of the work are permitted.

CC BY-NC-ND: This license allows reusers to copy and distribute the material in any medium or format in unadapted form only, for noncommercial purposes only, and only so long as attribution is given to the creator.

CC BY-NC-ND includes the following elements:
BY – Credit must be given to the creator.
NC – Only noncommercial uses of the work are permitted.
ND – No derivatives or adaptations of the work are permitted.

The Creative Commons Public Domain Dedication

CC0 (aka CC Zero) is a public dedication tool that allows creators to give up their copyright and put their works in to the worldwide public domain. CC0 allows reusers to distribute, remix, adapt, and build upon the material in any medium or format, with no conditions.

Choosing a License

The six licenses and the public domain dedication tool give creators a range of options. The best way to decide which is appropriate for you is to think about why you want to share your work, and how you hope others will use it. For help, try the Creative Commons License Chooser.

Before Licensing

Before you apply a CC license or CC0 to your material, there are some essential things to consider:

The licenses and CC0 cannot be revoked. Therefore, once you apply for a CC license, anyone who receives it may rely on that license for as long as the material is protected by copyright, even if you later stop distributing it;
You must own or control copyright in the work. Only the copyright holder or someone with permission from the copyright holder can apply a CC license or CC0 to a copyrighted work. If you created a work in the scope of your job, you might not be the copyright holder.

See this page for more pre-licensing considerations.

How to Apply a CC license or CC0 to Your Work

CC-licensing your work is simple: Choose the license that suits your needs and then communicate this choice to people who come across your work. As part of this communication, you should include a link to the license you’ve chosen.

This statement can be as simple as a text stating and linking to the license in a copyright notice, like this:

You can also make it more complex by embedding the license information on your website using the HTML code associated with the particular license. Use the Creative Commons License Chooser to get the relevant HTML code.

Source: https://creativecommons.org/about/cclicenses/